The Last Secret Love(1980)

Original title: 마지막 밀애

Yeong-kyeong is a famous musician who is seduced by Dong-min. Dong-min wanted a one night fling, but Yeong-kyeong pities him, believing hs story of being trapped in a loveless marriage. Dong-min has no intention of leaving his wife, however she finds out about his affair and leaves him. Dong-min escapes to his uncle's cabin in the mountains, but Yeong-kyeong follows him even there.